Resolves issue with vmware_dvs_host module for v2.0
When this module was written back in May 2015 we were using 1.9.x. Being lazy I added to param the objects that the other functions would need. What I have noticed is in 2.0 exit_json is trying to jsonify those complex objects and failing. This PR resolves that issue with the vmware_dvs_host module.
@kamsz reported this issue in https://github.com/ansible/ansible-modules-extras/pull/1568
Playbook
```
- name: Add Host to dVS
local_action:
module: vmware_dvs_host
hostname: "{{ mgmt_ip_address }}"
username: "{{ vcsa_user }}"
password: "{{ vcsa_pass }}"
esxi_hostname: "{{ hostvars[item].hostname }}"
switch_name: dvSwitch
vmnics: "{{ dvs_vmnic }}"
state: present
with_items: groups['foundation_esxi']
```
Module Testing
```
TASK [Add Host to dVS] *********************************************************
task path: /opt/autodeploy/projects/emmet/site_deploy.yml:234
ESTABLISH LOCAL CONNECTION FOR USER: root
localhost EXEC ( umask 22 && mkdir -p "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694039.6-259977654985844 )" && echo "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694039.6-259977654985844 )" )
localhost PUT /tmp/tmpGrHqbd TO /root/.ansible/tmp/ansible-tmp-1454694039.6-259977654985844/vmware_dvs_host
localhost EXEC LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1454694039.6-259977654985844/vmware_dvs_host; rm -rf "/root/.ansible/tmp/ansible-tmp-1454694039.6-259977654985844/" > /dev/null 2>&1
localhost EXEC ( umask 22 && mkdir -p "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694058.76-121920794239796 )" && echo "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694058.76-121920794239796 )" )
localhost PUT /tmp/tmpkP7DPu TO /root/.ansible/tmp/ansible-tmp-1454694058.76-121920794239796/vmware_dvs_host
localhost EXEC LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1454694058.76-121920794239796/vmware_dvs_host; rm -rf "/root/.ansible/tmp/ansible-tmp-1454694058.76-121920794239796/" > /dev/null 2>&1
localhost EXEC ( umask 22 && mkdir -p "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694090.2-33641188152663 )" && echo "$( echo $HOME/.ansible/tmp/ansible-tmp-1454694090.2-33641188152663 )" )
localhost PUT /tmp/tmp216NwV TO /root/.ansible/tmp/ansible-tmp-1454694090.2-33641188152663/vmware_dvs_host
localhost EXEC LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1454694090.2-33641188152663/vmware_dvs_host; rm -rf "/root/.ansible/tmp/ansible-tmp-1454694090.2-33641188152663/" > /dev/null 2>&1
changed: [foundation-vcsa -> localhost] => (item=foundation-esxi-01) => {"changed": true, "invocation": {"module_args": {"esxi_hostname": "cscesxtmp001", "hostname": "172.27.0.100", "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", "state": "present", "switch_name": "dvSwitch", "username": "root", "vmnics": ["vmnic2"]}, "module_name": "vmware_dvs_host"}, "item": "foundation-esxi-01", "result": "None"}
changed: [foundation-vcsa -> localhost] => (item=foundation-esxi-02) => {"changed": true, "invocation": {"module_args": {"esxi_hostname": "cscesxtmp002", "hostname": "172.27.0.100", "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", "state": "present", "switch_name": "dvSwitch", "username": "root", "vmnics": ["vmnic2"]}, "module_name": "vmware_dvs_host"}, "item": "foundation-esxi-02", "result": "None"}
changed: [foundation-vcsa -> localhost] => (item=foundation-esxi-03) => {"changed": true, "invocation": {"module_args": {"esxi_hostname": "cscesxtmp003", "hostname": "172.27.0.100", "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", "state": "present", "switch_name": "dvSwitch", "username": "root", "vmnics": ["vmnic2"]}, "module_name": "vmware_dvs_host"}, "item": "foundation-esxi-03", "result": "None"}
```
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